---

ACE_Select_Reactor_Notify Class Reference

Unblock the <ACE_Select_Reactor> from its event loop. More...

#include <Select_Reactor_Base.h>

Inheritance diagram for ACE_Select_Reactor_Notify:

[legend]Collaboration diagram for ACE_Select_Reactor_Notify:

[legend]List of all members.

Public Methods
	ACE_Select_Reactor_Notify (void)
	Constructor.
	~ACE_Select_Reactor_Notify (void)
	Destructor.
virtual int	open (ACE_Reactor_Impl *, ACE_Timer_Queue *=0, int disable_notify_pipe=0)
	Initialize.
virtual int	close (void)
	Destroy.
virtual int	notify (ACE_Event_Handler *=0, ACE_Reactor_Mask=ACE_Event_Handler::EXCEPT_MASK, ACE_Time_Value *=0)
virtual int	dispatch_notifications (int &number_of_active_handles, ACE_Handle_Set &rd_mask)
virtual ACE_HANDLE	notify_handle (void)
virtual int	dispatch_notify (ACE_Notification_Buffer &buffer)
virtual int	read_notify_pipe (ACE_HANDLE handle, ACE_Notification_Buffer &buffer)
virtual int	is_dispatchable (ACE_Notification_Buffer &buffer)
	Verify whether the buffer has dispatchable info or not.
virtual int	handle_input (ACE_HANDLE handle)
virtual void	max_notify_iterations (int)
virtual int	max_notify_iterations (void)
virtual int	purge_pending_notifications (ACE_Event_Handler *, ACE_Reactor_Mask=ACE_Event_Handler::ALL_EVENTS_MASK)
virtual void	dump (void) const
	Dump the state of an object.
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Protected Attributes
ACE_Select_Reactor_Impl *	select_reactor_
ACE_Pipe	notification_pipe_
int	max_notify_iterations_

---

Detailed Description

Unblock the <ACE_Select_Reactor> from its event loop.

This implementation is necessary for cases where the <ACE_Select_Reactor> is run in a multi-threaded program. In this case, we need to be able to unblock <select> or <poll> when updates occur other than in the main <ACE_Select_Reactor> thread. To do this, we signal an auto-reset event the <ACE_Select_Reactor> is listening on. If an <ACE_Event_Handler> and <ACE_Select_Reactor_Mask> is passed to <notify>, the appropriate <handle_*> method is dispatched in the context of the <ACE_Select_Reactor> thread.

---

Constructor & Destructor Documentation

ACE_Select_Reactor_Notify::ACE_Select_Reactor_Notify (  void    )

Constructor.

ACE_INLINE ACE_Select_Reactor_Notify::~ACE_Select_Reactor_Notify (  void    )

Destructor.

---

Member Function Documentation

int ACE_Select_Reactor_Notify::close (  void    )  [virtual]

Destroy. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::dispatch_notifications (  int &    number_of_active_handles, ACE_Handle_Set &    rd_mask )  [virtual]

Handles pending threads (if any) that are waiting to unblock the <ACE_Select_Reactor>. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::dispatch_notify (  ACE_Notification_Buffer &    buffer )  [virtual]

Handle one of the notify call on the <handle>. This could be because of a thread trying to unblock the <Reactor_Impl> Implements ACE_Reactor_Notify.

void ACE_Select_Reactor_Notify::dump (  void    )  const [virtual]

Dump the state of an object. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::handle_input (  ACE_HANDLE    handle )  [virtual]

Called back by the <ACE_Select_Reactor> when a thread wants to unblock us. Reimplemented from ACE_Event_Handler.

int ACE_Select_Reactor_Notify::is_dispatchable (  ACE_Notification_Buffer &    buffer )  [virtual]

Verify whether the buffer has dispatchable info or not. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::max_notify_iterations (  void    )  [virtual]

Get the maximum number of times that the <ACE_Select_Reactor_Notify::handle_input> method will iterate and dispatch the <ACE_Event_Handlers> that are passed in via the notify pipe before breaking out of its <recv> loop. Implements ACE_Reactor_Notify.

void ACE_Select_Reactor_Notify::max_notify_iterations (  int    )  [virtual]

Set the maximum number of times that the <ACE_Select_Reactor_Notify::handle_input> method will iterate and dispatch the <ACE_Event_Handlers> that are passed in via the notify pipe before breaking out of its <recv> loop. By default, this is set to -1, which means "iterate until the pipe is empty." Setting this to a value like "1 or 2" will increase "fairness" (and thus prevent starvation) at the expense of slightly higher dispatching overhead. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::notify (  ACE_Event_Handler *    = 0, ACE_Reactor_Mask    = ACE_Event_Handler::EXCEPT_MASK, ACE_Time_Value *    = 0 )  [virtual]

Called by a thread when it wants to unblock the <ACE_Select_Reactor>. This wakeups the <ACE_Select_Reactor> if currently blocked in <select>/<poll>. Pass over both the <Event_Handler> *and* the <mask> to allow the caller to dictate which <Event_Handler> method the <ACE_Select_Reactor> will invoke. The <ACE_Time_Value> indicates how long to blocking trying to notify the <ACE_Select_Reactor>. If <timeout> == 0, the caller will block until action is possible, else will wait until the relative time specified in *<timeout> elapses). Implements ACE_Reactor_Notify.

ACE_HANDLE ACE_Select_Reactor_Notify::notify_handle (  void    )  [virtual]

Returns the ACE_HANDLE of the notify pipe on which the reactor is listening for notifications so that other threads can unblock the Select_Reactor Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::open (  ACE_Reactor_Impl *   , ACE_Timer_Queue *    = 0, int    disable_notify_pipe = 0 )  [virtual]

Initialize. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::purge_pending_notifications (  ACE_Event_Handler *   , ACE_Reactor_Mask    = ACE_Event_Handler::ALL_EVENTS_MASK )  [virtual]

Purge any notifications pending in this reactor for the specified <ACE_Event_Handler> object. If <eh> == 0, all notifications for all handlers are removed (but not any notifications posted just to wake up the reactor itself). Returns the number of notifications purged. Returns -1 on error. Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::read_notify_pipe (  ACE_HANDLE    handle, ACE_Notification_Buffer &    buffer )  [virtual]

Read one of the notify call on the <handle> into the <buffer>. This could be because of a thread trying to unblock the <Reactor_Impl> Implements ACE_Reactor_Notify.

---

Member Data Documentation

ACE_Select_Reactor_Notify::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

int ACE_Select_Reactor_Notify::max_notify_iterations_ [protected]

Keeps track of the maximum number of times that the <ACE_Select_Reactor_Notify::handle_input> method will iterate and dispatch the <ACE_Event_Handlers> that are passed in via the notify pipe before breaking out of its <recv> loop. By default, this is set to -1, which means "iterate until the pipe is empty."

ACE_Pipe ACE_Select_Reactor_Notify::notification_pipe_ [protected]

Contains the <ACE_HANDLE> the <ACE_Select_Reactor> is listening on, as well as the <ACE_HANDLE> that threads wanting the attention of the <ACE_Select_Reactor> will write to.

ACE_Select_Reactor_Impl* ACE_Select_Reactor_Notify::select_reactor_ [protected]

Keep a back pointer to the <ACE_Select_Reactor>. If this value if NULL then the <ACE_Select_Reactor> has been initialized with <disable_notify_pipe>.

---

The documentation for this class was generated from the following files:

• Select_Reactor_Base.h
• Select_Reactor_Base.cpp
• Select_Reactor_Base.i

---